The three new trucks follow a pilot scheme launched in 2015 that snared over 4,000 dangerous drivers in its first two years.

Nearly two-thirds of the drivers were stopped for illegally using a phone – despite the penalty doubling to six points and a £200 fine last year.

Offenders were also caught watching DVDs, brushing their teeth, reading books and even boiling a kettle.

Richard Leonard, Highways England’s head of road safety, said: “Highways England has been funding a single cab for the past couple of years and we’ve been impressed with the impact it’s had on improving safety.